Abstract: Poyang Lake Eco-economic Zone is one of the accelerating poles of growth in central China. Understanding vegetation changes will provide support for more reasonable regulation and control of economic development and ecological protection in the Eco-economic Zone. Based on MODIS NDVI from 2000 to 2017, we explored the temporal and spatial characteristics of NDVI before and after the establishment of the Eco-economic Zone by using the slope of least square method and quantitatively examined the effects of climate and human factors on NDVI changes by means of correlation analysis. The results showed that before (2000-2008) and after (2009-2017) the establishment of the Zone, the overall vegetation showed an increasing growth trend. The NDVI growth showed a trend of 0.052 10 a^-1 (P<0.05) and 0.025 10 a^-1 (P<0.05) before and after the establishment of the Eco-economic Zone, respectively. After the establishment of the Eco-economic Zone, the growth of NDVI slowed down. Spatially, vegetation degradation occurred around prefectural cities and the provincial capital before the establishment of Eco-economic Zone, which intensified after its establishment. Furthermore, after the establishment of the Zone, vegetation degradation expanded to area around the lake, northern region and southern farming areas. In terms of influencing factors, on the regional scale, climatic factors were the dominant factors for NDVI change, with the influence of temperature on NDVI being greater than that of precipitation. In areas where NDVI changed significantly, human activities were the main factors affecting NDVI changes. Before the establishment of the Eco-economic Zone, the acceleration of urbanization was the main human factor causing the regional vegetation degradation. After the establishment of the Eco-economic Zone, vegetation degradation in the farming and lake areas, non-agricultural construction land occupation of other types of land, and rural homestead occupation of grassland were important anthropogenic factors inducing regional vegetation degradation.

Key words: Phosphorus bacteria fertilizer, Olsen-P, microbial community diversity, alkaline phosphatase., reclaimed soil